If you don't have an imagination, get out. That's the whole point that I, and I think most people, bought the game. This game is for people that have an imagination, but not a way of using it. One of the media pictures on the Blockland home page says, "The only limit is your imagination."
What do you want to make? A house? An add-on? A super giant spaceship? A tactical death match? A cake?